Add Cloudflare and Loki MCP server integrations

Features:
- Cloudflare Code Mode MCP: Exposes entire Cloudflare API (2,500+ endpoints)
  via remote MCP server at https://mcp.cloudflare.com/mcp
  * Two tools: search() to query OpenAPI spec, execute() to run JS code
  * Uses npx mcp-remote as stdio bridge
  * Auth via CLOUDFLARE_API_TOKEN as Bearer header

- Loki MCP Server: Log querying and analysis via Loki HTTP API
  * Query logs with LogQL syntax
  * Real-time log streaming support
  * Label introspection and metrics queries
  * Configurable via LOKI_URL environment variable

Technical changes:
- Created mcp_servers/cloudflare/ with config and connection logic
- Created mcp_servers/loki/ with HTTP client and MCP tool wrappers
- Added promtail-config-optimized.yaml for syslog ingestion config
- Updated .env.example with Cloudflare and Loki configuration templates

Both integrations:
- Use environment variables for configuration (no hardcoded credentials)
- Include feature flags (CLOUDFLARE_MCP_ENABLED, LOKI_MCP_ENABLED)
- Follow existing MCP server patterns for consistency

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

mcp_servers/cloudflare/__init__.py

@@ -0,0 +1,9 @@
+# Cloudflare Code Mode MCP Server
+#
+# Remote MCP server at https://mcp.cloudflare.com/mcp
+# Uses "Code Mode" — 2 tools (search + execute) covering the entire
+# Cloudflare API (2,500+ endpoints) in ~1,000 tokens.
+#
+# Auth: Cloudflare API Token (Bearer header via mcp-remote bridge)
+# Docs: https://blog.cloudflare.com/code-mode-mcp/
+# Repo: https://github.com/cloudflare/mcp